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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Dec. 18, 2018	Nov. 02, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Stockholders Equity [Line Items]
Stock issued for acquisition			$ 3,371		$ 2,922
Treasury stock at cost			$ 19,864	$ 5,815
Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Stock issued for acquisition, Shares			40,478		43,953
Stock repurchase program, authorized amount		$ 50,000
Stock repurchase program, period		2 years
Repurchase of treasury shares			(289,745)	(122,147)
Stock repurchase program, available for future repurchases			$ 24,300
CovalentWorks [Member]
Schedule Of Stockholders Equity [Line Items]
Stock issued for acquisition, Shares	40,478
Stock issued for acquisition	$ 3,371

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